hlar- verb "hear", future tense hlaruva "shall hear" in Markirya. Since the original root is SLAS, this verb may have the past tense *hlassë (for slansē) in more classical forms of Quenya, perhaps re-formed as *hlarnë (or *hlarrë, for hlazze) in spoken Noldorin Quenya. Compare #hriz- "snow" (root SRIS) with past tense hrinsë/hrissë, as well as Tolkien's remarks in PE19:99.
Quenya
lasta-
verb. to listen, to listen; [ᴹQ.] to hear
lasta-
verb. listen
hlasta-/lasta-
verb. hear
cen
noun. sight, sight, *sense of sight
hlar-
verb. hear
ten-
verb. hear
ten- (4) vb. "hear", future tense tenuva (MC:213; in Tolkien's later Quenya, "hear" is hlar-)
tihta-
verb. blink, peer
tihta- vb. "blink, peer", participle tihtala in an earlier variant of Markirya
cénë
noun. sight
lasta- vb. "listen", also lasta adj. "listening, hearing" (LAS2, PE17:56); cf. adj. asalastë (*aþa-) adj. "easily heard" (PE17:148)