swallow vs sip

swallow and sip both are nouns.

Word	Noun	Adjective	Verb	Adverb
swallow	Yes	No	Yes	No
sip	Yes	No	Yes	No

As nouns, sip is a hyponym of swallow; that is, sip is a word with a more specific, narrower meaning than swallow:

Other hyponyms of swallow include aerophagia, draft, draught, gulp, swig.

swallow (noun)	sip (noun)
the act of swallowing	a small drink
small long-winged songbird noted for swift graceful flight and the regularity of its migrations
a small amount of liquid food

swallow (verb)	sip (verb)
believe or accept without questioning or challenge	drink in sips
keep from expressing
tolerate or accommodate oneself to
take back what one has said
utter unclearly
engulf and destroy
pass through the esophagus as part of eating or drinking
enclose or envelop completely, as if by swallowing