Word: firms
Part of speech: Noun
Syllables: firms
Definition: The principal rafters of a roof, especially a pair of rafters taken together.
Morphemes:
Affix: firm
Language: en
PoS: Noun
Meaning: A criminal gang, especially based around football hooliganism.
Etymology Compounds: Affix: firmare
Language: la
Decoded: firmare
Meaning: to make firm, to confirm 
Affix: -s
Language: en
PoS: Suffix
Meaning: Used to form many pluralia tantum (nouns that are almost or entirely without singular forms).