`Forebear’ is a noun, and `forbear’ is a verb. It is also possible to spell the noun, `forbear’. When used as a noun, the word means `ancestor’; the stress, in this case, is on the first syllable. The word is considered literary.
Example: Thiru has every intention of returning to the land of his forebears.
When used as a verb, `forbear’ means `refrain from’. In this case, the stress is on the second syllable, `bear’. The past tense of `forbear’ is `forbore’.
Example: The witness turned hostile and forbore to answer many of the questions.