different between ammonoid vs cephalopod

English

From the scientific name Ammonoidea.

ammonoid (plural ammonoids)

An extinct cephalopod of the subclass Ammonoidea (including ammonites).
- 2017, Mark Carnall, The Guardian, 9 August:
  Although the extinct externally shelled cephalopods ammonoids have an extensive fossil record, their soft tissues are very poorly known and, like extinct and living nautiloids, they are largely presumed to not have possessed an ink sac.

ammonoid (comparative more ammonoid, superlative most ammonoid)

From French céphalopode, from Ancient Greek ?????? (kephal?, “head”) + ????? (podós), genitive singular of ???? (poús, “foot, leg”).

cephalopod (plural cephalopods)

Any mollusc, of the class Cephalopoda, which includes squid, cuttlefish, octopus, nautiloids etc.

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