teachable
Yes, you can add the suffix "able" to "teach" to make it "teachable." This turns the word into an adjective meaning capable of being taught.
The suffix of "conceivable" is "-able."
The suffix for "lovable" is "able".
The suffix of valuable is -able.
The suffix in respectable(respect-able) is able.
The suffix -worthy means suitable for or suited to.
By adding the suffix -able. The word is retractable.
The suffix of "unmanageable" is "-able."
The suffix for blame is "-able."
The suffix for "sustain" is "-able."
The suffix for "improbable" is "-able".
The suffix of "inconsolable" is -able.