In order to formulate a uniform heading for each subject, choices often have to be made among synonymous terms, between scientific and popular terms, among different language forms and variant spellings, and between current and obsolete terms.

6.11 Choice among synonyms

6.12 Scientific (or technical) terms vs. popular terms

6.13 Language (English vs. vernacular)

6.14 Choice among variant spellings

6.15 Current vs. obsolete terms

See also:

6.0 Terminology