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любовник n stresses
gen.	lover; paramour; fancy man; leman; love-mate; boyfriend (last_tochka); love mate; theater; gallant; minion; illicit lover (Taras); lover boy (Taras); amorist; wooer
euph.	coleslaw (a bit on the side // The Guardian, 2020 Alex_Odeychuk)
fr.	bon ami; ami
Gruzovik, poetic	fan (= любитель)
idiom.	bit on the side (Interex)
inf.	john
ital.	inamorato
obs.	beloved; person in love
rude, Makarov.	lay
slang	Johnny; body and soul; love bird (обычно во мн.ч. – голубки, парочка); love-bird (обычно во мн.ч. – голубки, парочка); lovebird (обычно во мн.ч. – голубки, парочка); mash; papa; passion ration; sheik; sweet man; heavy date; manfriend (Марчихин)
vulg.	ace lane; ace; bachelor of hearts; bloke; bonker; boy; buddy; candy man; chaser; constant companion; courteer; crusher; dingdong daddy; fancy-piece; fellow; feminine heart pumper; flame; flipper; flutterbum; follower; friend; fusser; guy; jack of hearts; jack; jelly; knave of hearts; lamb; lapful; lollygagger; main squeeze; man; mellow; old man; partner; puppy; roguer; squeeze; stud; sweetheart; young man; boy-friend; daddy (особ. оплачивающий любовную связь); la-la; last heartbeat
любовники n
gen.	lovebirds (Taras)
college.vern.	gruesome twosome
Makarov.	inamoratos
любовникца n
slang	squeeze (Interex)
Russian thesaurus
любовник n
obs., poetic	любитель

любовник: 152 phrases in 15 subjects

American usage, not spelling	3
Cinematography	1
Contemptuous	1
Figurative	1
General	37
Idiomatic	1
Informal	9
Literature	3
Makarov	7
News style	1
Obsolete / dated	3
Sex and sexual subcultures	1
Slang	22
Theatre	1
Vulgar	61