The definition of 'sipunculids' & the word 'sipunculids' in example sentences or phrases

Noun
1
small unsegmented marine worm that when disturbed retracts its anterior portion into the body giving the appearance of a peanut

Synonyms of the word 'sipunculids' & Antonyms of the word 'sipunculids'.

Noun
Synonymspeanut worm*,