infectious vs infective

infectious and infective both are adjectives.

Word	Noun	Adjective	Verb	Adverb
infectious	No	Yes	No	No
infective	No	Yes	No	No

As adjectives, infectious and infective are synonyms defined as:

infectious and infective: caused by infection or capable of causing infection

infectious (adjective)	infective (adjective)
easily spread	caused by infection or capable of causing infection
of or relating to infection	able to cause disease
caused by infection or capable of causing infection