1

昨天

zuótiān

yesterday

2

天氣

tiānqì

weather

=3

冷

Lěng

surname Leng

=3

冷

lěng

cold

=3

冷

líng

only used in 冷凙／冷𪞝

=3

冷

lǐng

only used in 㓑冷

=4

嗎

má

(coll.) what?

=4

嗎

mǎ

used in 吗啡 mǎfēi

=4

嗎

ma

(question particle for "yes-no" questions)