We don't have synonyms for key seat yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are keyseat, keyset and key west.
(n) :
Alternative form of keyseat. [A bed or groove to receive a key which prevents one mechanical part from turning on another; especially, one with blind ends and a press-fit, such as one that seats a Woodruff key.]
(n) :
Alternative form of keyseat. [A bed or groove to receive a key which prevents one mechanical part from turning on another; especially, one with blind ends and a press-fit, such as one that seats a Woodruff key.]