From the MODS guidelines on personal names:
"description" may be used to give a textual description for a name when necessary, for example, to distinguish from other names. This element does not have a MARC 21 equivalent.
Surely the MARC 21 equivalent is X00 $c.
The examples in the MODS guidelines are "American artist, 20th c" and "District Commissioner", while the examples in MARC 21 X00 include "clockmaker" and "map maker". AACR2R2002 22.19A.1 offers "(Notary)" and "(Anglo-Norman poet)".
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