serger vs sewing machine

serger and sewing machine both are nouns.

Word	Noun	Adjective	Verb	Adverb
serger	Yes	No	No	No
sewing machine	Yes	No	No	No

As nouns, sewing machine is a hypernym of serger; that is, sewing machine is a word with a broader meaning than serger:

serger: a sewing machine that overcasts the raw edges of a fabric with a V-shaped stitch
sewing machine: a textile machine used as a home appliance for sewing

serger (noun)	sewing machine (noun)
a sewing machine that overcasts the raw edges of a fabric with a V-shaped stitch	a textile machine used as a home appliance for sewing