For ai)/louros see alphaiota 185, sigma 911.
As regards the present entry, both katta (feminine: LSJ entry at web address 1) and kattos (masculine) are attested. (Evagrius Scholasticus (C6 CE) implies that this was the commonly used word, and ailouros the learned word (PG 86.2880B); see Lampe s.v.) Thus one might have supposed the present entry's ka/tths, ka/ttou to be two genitives, feminine and masculine, but in fact ka/tths is also attested as a nominative: see George the Monk, Chronicon 253.9 (ku/wn kai\ ka/tths "dog and cat"), and under omicroniota 64.