n. 25B6; noun
a clump of trees : CLUSTER, thicket, group, bunch, assemblage.
a clump of earth : LUMP, clod, mass, gobbet, wad; informal glob; Brit. informal gob.
25B6; verb
galaxies clump together : CLUSTER, group, collect, gather, assemble, congregate, mass.
they were clumping around upstairs : STAMP, stomp, clomp, tramp, lumber; thump, thud, bang; informal galumph.