semipro vs semiprofessional

semipro and semiprofessional both are nouns.

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

As nouns, semipro and semiprofessional are synonyms defined as:

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

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