Difference between Facultative and Obligate

Facultative

Part of speech: adjective

Definition: Of or relating to faculty, especially to mental faculty Not obligate; optional, discretionary or elective That grants permission or power to do something

Obligate

Part of speech: adjective

Definition: Able to exist or survive only in a particular environment or by assuming a particular role: an obligate parasite; an obligate anaerobe.Absolutely indispensable; essential.

Part of speech: verb

Definition: To bind, compel, or constrain by a social, legal, or moral tie. See Synonyms at force.To cause to be grateful or indebted; to oblige.To commit (money, for example) in order to fulfill an obligation.