1) Be roommates 2) Domicile 3) Domiciliate 4) Dwell 5) Dwell with another 6) Inhabit 7) Live 8) Live together 9) People 10) Populate 11) Reside 12) Room or live together 13) Set up house together 14) Shack 15) Shack up 16) Share an apartment 17) Share digs 18) Share house 19) Share living quarters 20) Share more than space 1) Live together 2) Miscegenate 
• (v.) To inhabit or reside in company, or in the same place or country. • (v.) To dwell or live together as husband and wife.
Co·hab'it intransitive verb [ imperfect & past participle Cohabited ; present participle & verbal noun Cohabiting .] [ Latin cohabitare ; co- + habitare to dwell, to have possession of (a place), freg. of haber...
[v] - room or live together
cohabit Living together as husband and wife.
shack up verb room or live together; usually said of people who are not married and live together as a couple
To live together without a legal marriage ceremony.
to live together as husband and wife, usually without legal or religious sanction. · to live together in an intimate relationship. · to dwell with another or share the same place, as different species of animals.