Word: longfins
Part of speech: Noun
Syllables: long
fins
Definition: Plural of longfin;  which were formerly placed in the order Perciformes but are now regarded as being incertae sedis in the subseries Ovalentaria in the clade Percomorpha
Morphemes:
Affix: long
Language: en
PoS: Noun
Meaning: A long syllable; a unit of spoken language larger than a phoneme
Affix: fin
Language: en
PoS: Noun
Meaning: A similar appendage of a cetacean or other marine animal.
Affix: -s
Language: en
PoS: Suffix
Meaning: Used to form many pluralia tantum (nouns that are almost or entirely without singular forms).