A class plural suffix, identical to N. -ath (PE21/57). It is possible this suffix was also used as (and was perhaps inspired by) the Gnomish general plural suffix -th.
Middle Primitive Elvish
-asta
suffix. collective plural
b’rássē
noun. heat
There are more words but they are from Tolkien's earlier conceptional periods. Tolkien likely changed these words as he evolved the aesthetics and completeness of the languages. You may even find languages that Tolkien later rejected. Do not mix words from different time periods unless you are familiar with the phonetic developments.
Early Primitive Elvish
mbastā
noun. mbastā
Gnomish
ranoth
noun. month
ranuin
masculine name. Month
Qenya
aia(na)
adjective. alien, strange, any other, of another sort, other
aia-
prefix. other, different (of larger numbers)
Doriathrin
-ath
noun. collective plural
Below: Tolkien's Late Period (1950–1973). These are from Tolkien's late conceptual period — his most settled forms of the languages. Prefer these over the earlier ones above when composing new text.
Quenya
asta
month
asta (1) noun "month", a division of the year (VT42:20). Pl. astar is attested (Appendix D). According to VT48:11, the basic meaning of asta is "division, a part", especially one of other equal parts: "of the year, a month or period". According to VT48:19, asta is also used in Quenya as a group suffix (see quentasta).
asta
noun. month; division, part (esp. one of other equal parts)
asta-
verb. to heat, bake (by exposure to sun)
asta- (2) vb. "to heat, bake (by exposure to sun)" (PE17:148)
asta-
verb. to heat, bake (by exposure to sun)
úr
noun. heat
úrë
noun. heat
A word for “heat” and name of tengwa #36 [.] in The Lord of the Rings Appendix E (LotR/1123), a derivative of √UR “heat” (PE22/160). On the basis of Úrimë “August, ✱Hot-one”, its stem form might be ✱úri-. Its function as a tengwar name probably reflects its use for u-diphthongs in Tengwar spelling.
Conceptual Development: In the 1st edition of The Lord of the Rings the name of tengwa #36 was úr “heat” (RC/736), and in earlier documents on The Feanorian Alphabet this word was glossed “fire, heat” (PE22/51) or just “fire” (PE22/23); see the discussion under ᴹQ. úr for further details.
Sindarin
bôr
noun. heat
A noun appearing as bôr “heat” in notes on the Common Eldarin Article (CEA) from 1969 (PE23/136), where it was rejected and replaced by born “hot” (PE23/136).
Neo-Sindarin: I think Tolkien rejected bôr because he changed his example from a noun to an adjective rather than abandoning the word outright. As such I would retain ᴺS. bôr “heat” for purposes of Neo-Sindarin.
Conceptual Development: Early Noldorin word-lists of the 1920s had ᴱN. bordh “heat, rage” derived from primitive ᴱ✶mbúryā (PE13/139). On another page of this word list Tolkien had borth, bordh “hearth”, but that was revised to ᴱN. gorth. In the Early Noldorin Dictionary from this same period Tolkien gave ᴱN. bordh as an adjective glossed “hot, raging, wroth” with the same derivation as the corresponding noun.
lothron
noun. the month of May
narwain
noun. the month of January
brass
white heat
(i vrass, construct bras), pl. brais (i mrais) if there is a pl.
bôr
noun. heat
ranoth
noun. month
ûr
heat
(fire), pl. uir. Notice the homophone ûr ”wide”.
A prefix for “other, different” appearing in Demonstrative, Relative, and Correlative Stems (DRC) from 1948 (PE23/99). Tolkien considered several prior forms on the page where it appeared: {asta} >> {aia < asya} >> aia < ᴹ√AYA (PE23/99 note #27). Earlier drafts had {ar} (PE23/101 note #36) >> {ap-, apana-} >> {war- < gwar-} (PE23/102 note #36). Forms appearing in the rest of the document mostly showed {war(a)-} >> ai(a)-.
Neo-Quenya: For purposes of Neo-Quenya, I would use later hya- as the basis for “other” words, as with (pron.) hya “other thing” and (adj.) hyana “other” (VT49/14).