swiftlet vs swift

swiftlet and swift both are nouns.

Word	Noun	Adjective	Verb	Adverb
swiftlet	Yes	No	No	No
swift	Yes	Yes	No	No

As nouns, swift is a hypernym of swiftlet; that is, swift is a word with a broader meaning than swiftlet:

swiftlet: swift of eastern Asia; produces the edible bird's nest
swift: a small bird that resembles a swallow and is noted for its rapid flight

swiftlet (noun)	swift (noun)
swift of eastern Asia; produces the edible bird's nest	a small bird that resembles a swallow and is noted for its rapid flight
	common western lizard; seen on logs or rocks

swiftlet (adjective)	swift (adjective)
	moving very fast