yayness

As a noun gayness

is (countable) the state of being gay (cheerful).

As an interjection yayness is

(slang|childish) yay; hooray.

As a noun taxonomy

is the science or the technique used to make a classification.

As an interjection yayness is

(slang|childish) yay; hooray.

As interjections the difference between hooray and yayness

is that hooray is used to express approval, joy or victory while yayness is (slang|childish) yay; hooray.

As a noun hooray

is a shout to signify victory.

As a verb hooray

is to shout an expression of excitement.