Appetite

The first word I learnt for 'appetite' was 食欲 （しょくよく）. Today I've learnt a new one, 食い気 （くいけ）. The new word has a much lower frequency value.

食欲 （しょくよく） - appetite - freq. 677
食い気 （くいけ） - appetite - freq. 179

Related only by 「気」 another word I came across was:

色気 （いろけ） - interest in the opposite sex, sex appeal, glamor, sexual passion, romance, desire, seductiveness, charm, sensuality... What a lot of defintions...