hǎo​péng​you

good friend

好朋友 hǎo​péng​you
good friend adjective
a close or intimate friend

The two of them have been good friends since they were children.

menstruation adjective
slang for a woman's menstrual period; a visit from Aunt Flo

She is on her period today and doesn't feel very well.

Frequency

Written text
17.3 per million

Sources

Definitions
CC-CEDICT
Frequency data
BCC Corpus (BLCU)