semestrial vs semestral

semestrial and semestral both are adjectives.

Word	Noun	Adjective	Verb	Adverb
semestrial	No	Yes	No	No
semestral	No	Yes	No	No

As adjectives, semestrial and semestral are synonyms defined as:

semestrial and semestral: occurring every six months or during every period of six months

semestrial (adjective)	semestral (adjective)
occurring every six months or during every period of six months	occurring every six months or during every period of six months