a synonym for rare is scarce; difficult to find; not plentiful
A synonym for temper is temperament.
A synonym for varied is diverse.
I don't think there is a synonym for adjoined it is an antonym.
A synonym of undeniable is nonviable.
Distasteful is a synonym. Can't find an antonym
Here
Scarce
to find your way
If you have the meaning or definition then you will have a synonym of the word. Look up that synonym in a thesaurus.
A thesaurus is used to find and insert a synonym for an overused word.
Locate
It really depends on which software or website you are using, but a synonym is usually found in a thesaurus.
If you are trying to find a synonym of through, then I suggets "into" would be a good synonym.
Discover, uncover, ascertain.
receive, get, find, obtain, incur
refer