rabbet vs rebate

rabbet and rebate both are nouns.

Word	Noun	Adjective	Verb	Adverb
rabbet	Yes	No	Yes	No
rebate	Yes	No	Yes	No

As nouns, rabbet and rebate are synonyms defined as:

rabbet and rebate: a rectangular groove made to hold two pieces together

rabbet (noun)	rebate (noun)
a rectangular groove made to hold two pieces together	a rectangular groove made to hold two pieces together
	a refund of some fraction of the amount paid

rabbet (verb)	rebate (verb)
cut a rectangular groove into	cut a rebate in (timber or stone)
join with a rabbet joint	join with a rebate
	give a reduction in the price during a sale