We don't have synonyms for migmatites yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are migmatite and pegmatites.
(n) :
(geology) Any rock of mixed appearance, being an intimate mixture of granite and older rock, specifically from intense metamorphism which partially melts the rock, causing it to recrystallize in a state intermediate between igneous and metamorphic.
(n) :
(geology) Any rock of mixed appearance, being an intimate mixture of granite and older rock, specifically from intense metamorphism which partially melts the rock, causing it to recrystallize in a state intermediate between igneous and metamorphic.