| apse | (noun) a domed or vaulted recess or projection on a building especially the east end of a church; usually contains the altar | Synonyms: apsis |
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| collapse | (noun) the act of throwing yourself down; collapse; sink | Synonyms: flop |
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| (noun) a natural event caused by something suddenly falling down or caving in | - |
| (noun) a sudden large decline of business or the prices of stocks (especially one that causes additional failures) | Synonyms: crash |
| (noun) an abrupt failure of function or complete physical exhaustion | Synonyms: prostration |
| lapse | (noun) a mistake resulting from inattention | Synonyms: oversight |
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| (noun) a failure to maintain a higher state | Synonyms: backsliding, lapsing, relapse, relapsing, reversion, reverting |
| (noun) a break or intermission in the occurrence of something | - |
| prolapse | (noun) the slipping or falling out of place of an organ (as the uterus) | Synonyms: descensus, prolapsus |
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| relapse | (noun) a failure to maintain a higher state | Synonyms: backsliding, lapse, lapsing, relapsing, reversion, reverting |
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| synapse | (noun) the junction between two neurons (axon-to-dendrite) or between a neuron and a muscle | - |
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