lobworm vs lugworm

lobworm and lugworm both are nouns.

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

As nouns, lobworm and lugworm are synonyms defined as:

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

Other synonyms of lobworm include lug.

lobworm (noun)	lugworm (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