Attested since the 15th century; know + -able
knowable (comparative more knowable, superlative most knowable)
Try searching for words with the letters KNOWABLE, words with the phrase KNOWABLE, words starting with the letters KNOWABLE, or words ending in the letters KNOWABLE.
Words… ending with q, starting with q, starting with qa, starting with qo, with two letters, starting with x, starting with j, ending with j,
Some random searches:
HLMAFYO, OIMS, SOKB, GJLTE, HPYDCHZ, UTD,