Lunchroom rhymes with:
backroom, ballroom, barroom, bathroom, bedroom, boardroom, bridegroom, classroom, cloakroom, courtroom, darkroom, elbowroom, headroom, livingroom, mailroom, newsroom, playroom, restroom, schoolroom, stockroom, storeroom, sunroom, toolroom, washroom, workroom
Lunchroom sounds like:
langerman, langhorn, langhorne, lohengrin, longhorn, longshoremen, lungren