pol- (1) vb. "can" = have physical power and ability, as in polin quetë "I can speak (because mouth and tongue are free)". Cf. ista-, lerta- as verbs "can" with somewhat different shades of meaning. (VT41:6, PE17:181)
Quenya
pol
large, big (strong)
pol-
can
lerta-
can
lerta- vb. "can" in the sense "be free to do", being under no restraint (physical or other). Lertan quetë "I can speak (because I am free to do so, there being no obstacle of promise, secrecy, or duty)". Where the absence of a physical restraint is considered, this verb can be used in much the same sense as pol- (VT41:6)
-úmë
large
-úmë (3) suffix "large" (of quantity)", as in liyúmë "host" (VT48:32)
alat-
large, great in size
alat- prefix "large, great in size". (ÁLAT, cf. VT45:5). In Alatairë.
alta
large, great in size
alta (1) adj. *"large, great in size" (root meaning)(ÁLAT). Alat- in Alatairë, q.v.
nerdo
large, strong man
nerdo noun "large, strong man" (compare nér) (VT47:33)
úra
large
úra (2) adj. "large" (UR), probably obsoleted by #1 above
pol (2) adj. "large, big (strong)". Since this would be the sole example of a monosyllabic Quenya adjective, it may be that Tolkien is here citing the root POL rather than a complete word. Cf. polda.