A noun in The Etymologies of the 1930s glossed “building, house” derived from primitive ᴹ✶atakwē under the root ᴹ√TAK “fix, make fast” (Ety/TAK). Here the ancient kw became p and then the voiceless t, p became voiced d, b as they generally did after vowels. It had a (Noldorin) plural form edeb, also appearing in a (rejected) name N. Edeb na Nestad “Houses of Healing” from Lord of the Rings drafts of the 1940s (WR/380). Its Sindarin plural would be ✱edaib.
Conceptual Development: The Gnomish Lexicon of the 1910s Tolkien had G. bad “building, outhouse, shed” related to G. bada- “build” (GL/21). In Early Noldorin Word-lists of the 1920s Tolkien had ᴱN. adob “(a) building” from primitive ᴱ✶atāqa (PE13/136, 158, 165); in this period it also served as the infinitive of the verb N. adag- “to build, erect” (PE13/132, 158).
Neo-Sindarin: For purposes of Neo-Sindarin I would use this word primarily in the sense of “a building”; for an ordinary “house” where people live, I would use S. bâr.
A hypocoristic (affectionate) word for “father” in The Etymologies of the 1930s, hence roughly equivalent to English “daddy”, derived from the root ᴹ√ATA “father” (Ety/ATA).
Conceptual Development: A similar set of affection words appeared the Gnomish Lexicon of the 1910s: G. ada or nada, adi or nadi (GL/17, 59).