quiltanoun "girdle, belt" (QL:78); the same source also lists a verb qilti- (sic) “gird, encircle”; one could perhaps read *quilta- if this verb were to be adapted to Tolkien’s later Quenya.
químari ("q") noun in pl. "phantoms" (MC:213; in LotR-style Quenya rather fairi, sg. fairë)
quingi ("q") noun "twang, of strings, harp" (LT1:256; rather tingë, tango in Tolkien's later Quenya)
quiquiëadv. “whenever”. Also quië. (VT49:23, 35, 36)
quín, quínënoun “crest, ridge” (PE17:24)
quinnaadj. “crested” (PE17:24)
#quir- vb. "stir" or make spin (actually cited as quiri-, perhaps with the connecting vowel of the aorist included); pa.t. quindë(QL:77)
quorin("q") adj. "drowned, choked" (LT1:264) Some will reject this as a valid word in LotR-style Quenya, since quo- may not be a possible combination in this later version of the High-Elven language.
quoro- ("q") vb. "choke, suffocate" (LT1:264; verbal stems ending in -o are not known from Tolkien's later Quenya; read *quor-?) See quorin.
-r nominative plural ending regularly used on nouns ending in -a, -i, -ië, -o, -u, e.g. Ainur, Valar, tier. Occasionally it is added also to nouns ending in -ë (that normally take the ending -I in the pl.). This seems to regularly happen in the case of nouns in -lë (see #fintalë, mallë, tyellë), sometimes also otherwise (see Ingwë, wendë, essë #1). This plural ending was ("it is said") first used by the Noldor (PM:402).
-r plural ending used on verbs with a plural subject (VT49:48, 50, 51), e.g. lantar “fall” in Namárië (with the plural subject lassi “leaves”), or unduláver as the pl. form of undulávë “licked down, covered” (PE17:72). The ending is sometimes missing where we might expect it; for instance, the verb tarnë “stood” has multiple subjects and yet does not appear as *tarner in PE17:71.