| admass | (noun) the segment of the public that is easily influenced by mass media (chiefly British) | - |
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| amass | (verb) increase in amount by collecting or gathering | Synonyms: accumulate, conglomerate, cumulate, gather, pile up |
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| (verb) get or gather together | Synonyms: accumulate, collect, compile, hoard, pile up, roll up |
| biomass | (noun) the total mass of living matter in a given unit area | - |
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| (noun) plant materials and animal waste used as fuel | - |
| camass | (noun) any of several plants of the genus Camassia; North and South America | Synonyms: camas, camash, camosh, quamash |
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| groundmass | (noun) (geology) the matrix of fine-grained crystalline material in which larger crystals are embedded | - |
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| landmass | (noun) a large continuous extent of land | Synonyms: land mass |
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| mass | (adjective) formed of separate units gathered into a mass or whole | Synonyms: aggregate, aggregated, aggregative |
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| (noun) the property of a body that causes it to have weight in a gravitational field | - |
| (noun) the property of something that is great in magnitude | Synonyms: bulk, volume |
| (noun) the common people generally | Synonyms: hoi polloi, masses, multitude, people, the great unwashed |
| (noun) an ill-structured collection of similar things (objects or people) | - |
| (noun) a body of matter without definite shape | - |
| (noun) (often followed by `of') a large number or amount or extent | Synonyms: batch, deal, flock, good deal, great deal, hatful, heap, lot, mess, mickle, mint, mountain, muckle, passel, peck, pile, plenty, pot, quite a little, raft, sight, slew, spate, stack, tidy sum, wad |
| (verb) join together into a mass or collect or form a mass | - |