nocturnality

a tree; more specifically, a living tree / the bent and gnarled trunk or roots of an old tree / wood, lumber / something made of wood / in ancient China, a wooden musical instrument

sex life

a margay

in addition; furthermore / on top of (which)

the above / the top (position or direction) / the surface of / superior in skill, age, level, etc.

to travel by night

Clipping of 百鬼夜行 (hyakki yagyō).

travelling by night / Clipping of 夜行列車 (yakō ressha).

sex, gender / (grammar) gender