sidestroke vs swimming stroke

sidestroke and swimming stroke both are nouns.

Word	Noun	Adjective	Verb	Adverb
sidestroke	Yes	No	No	No
swimming stroke	Yes	No	No	No

As nouns, swimming stroke is a hypernym of sidestroke; that is, swimming stroke is a word with a broader meaning than sidestroke:

sidestroke: a swimming stroke in which the arms move forward and backward while the legs do a scissors kick
swimming stroke: a method of moving the arms and legs to push against the water and propel the swimmer forward

sidestroke (noun)	swimming stroke (noun)
a swimming stroke in which the arms move forward and backward while the legs do a scissors kick	a method of moving the arms and legs to push against the water and propel the swimmer forward