great-grandchild

• POS: Noun
• HYPHEN: great-grand=child

CIDE DICTIONARY

great-grandchild, n. 

 The child of one's grandson or granddaughter.  [1913 Webster]

ROGET THESAURUS

great-grandchild

Posterity

N posterity, progeny, breed, issue, offspring, brood, litter, seed, farrow, spawn, spat, family, grandchildren, heirs, great-grandchild, child, son, daughter, butcha, bantling, scion, acrospire, plumule, shoot, sprout, olive-branch, sprit, branch, off-shoot, off- set, ramification, descendant, heir, heiress, heir-apparent, heir- presumptive, chip off the old block, heredity, rising generation, straight descent, sonship, line, lineage, filiation, primogeniture, filial, diphyletic, the child is father of the man, the fruit doesn't fall far from the tree, like father, like son.