occasional vs infrequent

occasional and infrequent both are adjectives.

Word	Noun	Adjective	Verb	Adverb
occasional	No	Yes	No	No
infrequent	No	Yes	No	No

occasional (adjective)	infrequent (adjective)
occurring from time to time	not frequent; not occurring regularly or at short intervals
occurring on a temporary or irregular basis
recurring or reappearing from time to time
occurring or appearing at usually irregular intervals