felya noun "cave" (PHÉLEG), "mine, boring, tunnel, underground dwel[ling]" (PE17:118)
Quenya
sap-
dig
felya
cave
rotelë
cave
rotelë noun "cave" (LT2:347)
rotto
cave, tunnel
rotto noun "cave, tunnel" (VT46:12), "a small grot or tunnel" (PM:365)
felco
cave, mine, underground dwelling
felco noun "cave, mine, underground dwelling" (PE17:118); also felca, felehta
sap- or sapa- vb. "dig", pa.t. sampë (PE16:145, QL:82); cf. sampa, and sapsanta below.