synecdochic

Words with a similar base: synecdochic, synecdochical

'synecdochic'

[synecdochic.s.01] as in: using the name of a part for that of the whole or the whole for the part; or the special for the general or the general for the special; or the material for the thing made of it

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Examples:
to use `hand' for `worker' or `ten sail' for `ten ships' or `steel' for `sword' is to use a synecdochic figure of speech