swim vs breaststroke

swim and breaststroke both are nouns.

Word	Noun	Adjective	Verb	Adverb
swim	Yes	No	Yes	No
breaststroke	Yes	No	Yes	No

As verbs, breaststroke is a hyponym of swim; that is, breaststroke is a word with a more specific, narrower meaning than swim:

swim: travel through water
breaststroke: swim with the face down and extend the arms forward and outward while kicking with the leg

Other hyponyms of swim include bathe, school, break water, fin, fin, paddle, crawl, backstroke, dive.

swim (noun)	breaststroke (noun)
the act of swimming	a swimming stroke; the arms are extended together in front of the head and swept back on either side accompanied by a frog kick

swim (verb)	breaststroke (verb)
travel through water	swim with the face down and extend the arms forward and outward while kicking with the leg
be afloat either on or below a liquid surface and not sink to the bottom
move as if gliding through water
be covered with or submerged in a liquid
be dizzy or giddy