Word: underground
Part of speech: Adjective
Syllables: un
der
ground
Definition: Outside the mainstream, especially unofficial and hidden from the authorities.
Morphemes:
Affix: under
Language: en
PoS: Adjective
Meaning: Being lower; being beneath something.
Affix: ground
Language: en
PoS: Adjective
Meaning: Crushed, or reduced to small particles.