buildups vs accretion

[Liqichao]

hello,
here are sentences: a. Supercooled water increases the rate of icing and is essential to rapid accretion. b.High altitude icing generally forms in tops of tall cumulus buildups.

I cannot tell 'buildups'and 'accretion'. Do both of them mean more in quantity?

thank you for your answers

[Mister Micawber]

.
Uh, yes, sort of. 'Accretion' is the process of the accumulation of particles or whatever, and a 'buildup' is the result of accumulating something in a location.
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Native English teacher at Mister Micawber's