官能基

functional group (chemistry)

surname Neng

can / to be able to / might possibly / ability / (physics) energy

surname Guan

government official / governmental / official / public / organ of the body / CL:個|个[ge4]

(bound form) base; foundation / (bound form) radical (chemistry) / (bound form) gay (loanword from English into Cantonese, Jyutping: gei1, followed by orthographic borrowing from Cantonese)

function / capability / sense (i.e. the five senses of sight 視|视, hearing 聽|听, smell 嗅, taste 味 and touch 觸|触) / faculty (i.e. specific ability)