is 欲求 actually pharmacy or am i crazy

ok so my brain always swaps 欲求 with yakkyoku (pharmacy) and i literally told my tutor i had a strong PHARMACY for ramen yesterday. Like a deep inner 欲求. Wait no. Isnt 欲求 desire?? But then 欲 looks so much like that other kanji... 歌? or something with singing. I literally can't keep them straight. And then there's 救 for rescue. My head hurts so much i need aspirin. From the... 欲求? Ugh whatever u know what i mean