Synonyms for Accretion:

n.

jump, surge, spurt, explosion, upswing, leap, upsurge. increase, skin, membrane, paint, buildup, proliferation, cover, plate, enlargement, blanket, surface, multiplication, layer, development. accretion (noun)
accumulation.
accumulation (noun)
addition, growth, buildup, increase.
gradual growth, addition (noun)
increase, accumulation.
process (noun)
accumulation.

Other synonyms:

buildup, addition. increase. multiplication. proliferation. enlargement, development. Other relevant words:
layer, enlargement, jump, plate, proliferation, leap, development, explosion, cover, paint, surge, membrane, buildup, skin, spurt, accumulation, multiplication, growth, increase, addition, upsurge, surface, blanket, upswing.