Word: speedster
Part of speech: Noun
Syllables: speed
ster
Definition: One who is noted for being very fast.
Morphemes:
Affix: speed
Language: en
PoS: Noun
Meaning: The state of moving quickly or the capacity for rapid motion.
Affix: -ster
Language: en
PoS: Suffix
Meaning: Someone who is, or who is associated with, or who does something specified.