The term 'GROW QUICKLY' can be represented by four different crossword solutions: SPROUT (6 letters), BURGEON (7 letters), MUSHROOM (8 letters), and SPROUTUP (8 letters). SPROUT is a verb that means to produce new shoots, buds, or leaves. BURGEON is a verb that means to grow or develop rapidly and vigorously. MUSHROOM is a noun that refers to a type of fungus that grows quickly in dark, damp places. SPROUTUP is a verb that means to grow or develop quickly. All of these words describe the process of something growing quickly.