unable to put into words

aquamarine (the color or the gemstone)

use one thing for many purposes / work someone hard

to use one's head

a Japanese word of ancient Japanese origin (as opposed to a word borrowed from Chinese, or composed in Japan from Chinese-derived roots) / Japanese songs or poetry (such as tanka)

male language, men's words

the censorship of words which are considered politically incorrect

expression, wording, way of speaking

wordplay

tongue-twister