Word: undergrounds
Part of speech: Noun
Syllables: un
der
grounds
Definition: Plural of underground; in or into hiding or secret operation
Morphemes:
Affix: under
Language: en
PoS: Adjective
Meaning: Being lower; being beneath something.
Affix: ground
Language: en
PoS: Noun
Meaning: The pit of a theatre.
Affix: -s
Language: en
PoS: Suffix
Meaning: Used to form many pluralia tantum (nouns that are almost or entirely without singular forms).