different between napiform vs napaceous

English

From Latin n?pus (“turnip”) +? -form

napiform (comparative more napiform, superlative most napiform)

(botany) Shaped like a turnip; spherical at the top, but with a tapering bottom.
- 2007 K. Kubitzki (ed.), The Families and Genera of Vascular Plants, volume IX, page 265
  The primary root is transformed into an perennating storage root, which is tuberous or napiform and then often branched

napaceous (not comparable)

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