4
member(noun, branch, tail, arm, stem)
3
appendage(noun, branch, tail, arm, stem)
3
louvre
3
pinna(noun, arm, fringe, paddle, quill)
3
tail fin(noun, expression, idiom)
3
wing(noun, branch, tail, stem, member)
2
Little Phoebe
2
airfoil(noun, arm)
2
barb
2
break water(verb, expression, idiom)
2
buck
2
fishtail
2
five-dollar bill(expression, idiom, money)
2
five-spot
2
flash
2
fluke
2
grand
2
hundred-dollar bill(expression, idiom, money)
2
limb(noun, branch, tail, member, appendage)
2
natation
11 years ago|5k views|share |citing 
APASmart Define. (2015). fin thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/fin/thesaurus/synonyms
ChicagoSmart Define. 2015. "fin thesaurus" https://smartdefine.org/fin/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, fin thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/fin/thesaurus/synonyms>.
MLASmart Define. "fin thesaurus" 13 April 2015. Web. 22 September 2026. <https://smartdefine.org/fin/thesaurus/synonyms>