Quenya 

tup-

verb. to cover, to cover, [ᴱQ.] put a lid on, put hat on, roof

tup-

cover

#tup- vb. "cover", isolated from untúpa, q.v. Variant top- in the Etymologies.

top-

cover

top- vb. "cover" (1st pers. aorist topë "covers"), pa.t. tompë (TOP). Variant tup-, q.v.