tel noun "roof" (LT1:268). Rather tópa in Tolkiens later Quenya.
Quenya
tup-
verb. cover
túpo
noun. cover, lid, roof
tel
roof
top-
verb. cover
top- vb. "cover" (1st pers. aorist topë "covers"), pa.t. tompë (TOP). Variant tup-, q.v.
tópa
roof
tópa noun "roof" (TOP)
tópa-
verb. roof
tópa- vb. "roof" (TOP)
#tup- vb. "cover", isolated from untúpa, q.v. Variant top- in the Etymologies.