| attack | (noun) (military) an offensive against an enemy (using weapons) | Synonyms: onrush, onset, onslaught |
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| (noun) a decisive manner of beginning a musical tone or phrase | Synonyms: tone-beginning |
| (noun) the act of attacking | Synonyms: attempt |
| (noun) ideas or actions intended to deal with a problem or situation | Synonyms: approach, plan of attack |
| (noun) an offensive move in a sport or game | - |
| (noun) strong criticism | - |
| (noun) intense adverse criticism | Synonyms: blast, fire, flack, flak |
| (noun) the onset of a corrosive or destructive process (as by a chemical agent) | - |
| (noun) a sudden occurrence of an uncontrollable condition | - |
| (verb) begin to injure | - |
| (verb) set to work upon; turn one's energies vigorously to a task | - |
| (verb) attack in speech or writing | Synonyms: assail, assault, lash out, round, snipe |
| (verb) launch an attack or assault on; begin hostilities or start warfare with | Synonyms: assail |
| (verb) take the initiative and go on the offensive | Synonyms: aggress |
| (verb) attack someone physically or emotionally | Synonyms: assail, assault, set on |
| bioattack | (noun) the use of bacteria or viruses or toxins to destroy men and animals or food | Synonyms: biologic attack, biological attack, biological warfare, BW |
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| chimneystack | (noun) the part of the chimney that is above the roof; usually has several flues | - |
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| counterattack | (noun) an attack by a defending force against an attacking enemy force in order to regain lost ground or cut off enemy advance units etc. | Synonyms: countermove |
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| (noun) (chess) an attack that is intended to counter the opponent's advantage in another part of the board | Synonyms: counterplay |
| (verb) make a counterattack | Synonyms: counterstrike |
| hackmatack | (noun) poplar of northeastern North America with broad heart-shaped leaves | Synonyms: balsam poplar, Populus balsamifera, tacamahac |
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| hardtack | (noun) very hard unsalted biscuit or bread; a former ship's staple | Synonyms: pilot biscuit, pilot bread, sea biscuit, ship biscuit |
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| (noun) a mountain mahogany | - |
| haystack | (noun) a stack of hay | Synonyms: hayrick, rick |
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| smokestack | (noun) a large tall chimney through which combustion gases and smoke can be evacuated | Synonyms: stack |
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| stack | (noun) a large tall chimney through which combustion gases and smoke can be evacuated | Synonyms: smokestack |
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| (noun) a storage device that handles data so that the next item to be retrieved is the item most recently stored (LIFO) | Synonyms: push-down storage, push-down store |
| (noun) a list in which the next item to be removed is the item most recently stored (LIFO) | Synonyms: push-down list, push-down stack |
| (noun) an orderly pile | - |
| (noun) (often followed by `of') a large number or amount or extent | Synonyms: batch, deal, flock, good deal, great deal, hatful, heap, lot, mass, mess, mickle, mint, mountain, muckle, passel, peck, pile, plenty, pot, quite a little, raft, sight, slew, spate, tidy sum, wad |
| (verb) arrange in stacks | Synonyms: heap, pile |
| (verb) load or cover with stacks | - |
| (verb) arrange the order of so as to increase one's winning chances | - |
| tack | (noun) sailing a zigzag course | - |
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| (noun) (nautical) the act of changing tack | Synonyms: tacking |
| (noun) a short nail with a sharp point and a large head | - |
| (noun) gear for a horse | Synonyms: saddlery, stable gear |
| (noun) (nautical) a line (rope or chain) that regulates the angle at which a sail is set in relation to the wind | Synonyms: mainsheet, sheet, shroud, weather sheet |
| (noun) the heading or position of a vessel relative to the trim of its sails | - |
| (verb) reverse (a direction, attitude, or course of action) | Synonyms: alternate, flip-flop, flip, interchange, switch |
| (verb) fasten with tacks | - |
| (verb) sew together loosely, with large stitches | Synonyms: baste |
| (verb) fix to; attach | Synonyms: append, hang on, tack on, tag on |
| (verb) create by putting components or members together | Synonyms: assemble, piece, put together, set up, tack together |
| (verb) turn into the wind | Synonyms: wear round |
| thumbtack | (noun) a tack for attaching papers to a bulletin board or drawing board | Synonyms: drawing pin, pushpin |
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| (verb) fasten with thumbtacks | - |
| ticktack | (noun) system of signalling by hand signs used by bookmakers at racetracks | - |
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| (verb) make a sound like a clock or a timer | Synonyms: beat, tick, ticktock |
| tintack | (noun) tack or small nail of tinned iron | - |
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