The difference between Spinetail and Swift
When used as nouns, spinetail means any of several species of swifts of , chaetura, and allied genera, in which the shafts of the tail feathers terminate in rigid spines, whereas swift means a small plain-colored bird of the family apodidae that resembles a swallow and is noted for its rapid flight.
Swift is also adverb with the meaning: swiftly.
Swift is also adjective with the meaning: fast.
check bellow for the other definitions of Spinetail and Swift
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Spinetail as a noun:
Any of several species of swifts of , Chaetura, and allied genera, in which the shafts of the tail feathers terminate in rigid spines.
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Spinetail as a noun:
Any of several species of South American and Central American clamatorial birds belonging to Synallaxis and allied genera of the family , allied to the ovenbirds.
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Spinetail as a noun (US, dialect):
The ruddy duck, Oxyura jamaicensis.
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Swift as an adjective:
Fast; quick; rapid.
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Swift as an adjective:
Capable of moving at high speeds.
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Swift as a noun:
A small plain-colored bird of the family Apodidae that resembles a swallow and is noted for its rapid flight.
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Swift as a noun:
Any of certain lizards of the genus Sceloporus.
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Swift as a noun:
A moth of the family Hepialidae, swift moth, ghost moth.
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Swift as a noun:
A reel for winding yarn.
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Swift as a noun:
The main cylinder of a carding-machine.
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Swift as a noun (obsolete):
The current of a stream.
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Swift as an adverb (obsolete, poetic):
Swiftly.