lover
US /ˈlʌv.ɚ/
UK /ˈlʌv.ɚ/

1.
a person who has a sexual or romantic relationship with someone, especially someone else's husband, wife, or partner
:
•
She discovered her husband had a lover.
•
They were secret lovers for years.
2.
a person who loves a specified thing or activity
:
•
He's a great animal lover.
•
She's a true art lover.