1

雙

shuāng

two double pair both even (number)

2

氯

lǜ

chlorine (chemistry)

=3

醇

chún

alcohol wine with high alcohol content rich pure good wine sterols

=3

醇

chún

old variant of 醇 chún

4

胺

àn

(chemistry) amine colloquial pr. ān; Taiwan pr. ān