Word: dirtbikes
Part of speech: Noun
Syllables: dirt
bikes
Definition: Plural of dirtbike;  describing how the motorcycles are put to use, or the designer's intent, or some combination of the two
Morphemes:
Affix: dirt
Language: en
PoS: Noun
Meaning: Soil or earth.
Etymology Compounds: Affix: drit
Language: enm
Decoded: drit
Meaning: excrement
Affix: bike
Language: en
PoS: Noun
Meaning: clipping of motorbike; ride a motorcycle
Affix: -s
Language: en
PoS: Suffix
Meaning: Used to form many pluralia tantum (nouns that are almost or entirely without singular forms).