semiprofessional vs semipro

semiprofessional and semipro both are nouns.

Word	Noun	Adjective	Verb	Adverb
semiprofessional	Yes	No	No	No
semipro	Yes	No	No	No

As nouns, semiprofessional and semipro are synonyms defined as:

semiprofessional and semipro: an athlete who plays for pay on a part-time basis

semiprofessional (noun)	semipro (noun)
an athlete who plays for pay on a part-time basis	an athlete who plays for pay on a part-time basis