lugworm vs lobworm

lugworm and lobworm both are nouns.

Word	Noun	Adjective	Verb	Adverb
lugworm	Yes	No	No	No
lobworm	Yes	No	No	No

As nouns, lugworm and lobworm are synonyms defined as:

lugworm and lobworm: marine worms having a row of tufted gills along each side of the back; often used for fishing bait

Other synonyms of lugworm include lug.

lugworm (noun)	lobworm (noun)
marine worms having a row of tufted gills along each side of the back; often used for fishing bait	marine worms having a row of tufted gills along each side of the back; often used for fishing bait