sow bug vs slater

sow bug and slater both are nouns.

Word	Noun	Adjective	Verb	Adverb
sow bug	Yes	No	No	No
slater	Yes	No	No	No

As nouns, slater is a hypernym of sow bug; that is, slater is a word with a broader meaning than sow bug:

sow bug: terrestrial isopod having an oval segmented body (a shape like a sow)
slater: any of various small terrestrial isopods having a flat elliptical segmented body; found in damp habitats

Other hypernyms of sow bug include wood louse, woodlouse.

sow bug (noun)	slater (noun)
terrestrial isopod having an oval segmented body (a shape like a sow)	any of various small terrestrial isopods having a flat elliptical segmented body; found in damp habitats