I looked up 'monsoon' in the Oxford English Dictionary. It lists 'tempest' and 'squall' as its synonyms. However monsoon is a rain-giving wind or the rainy season but the other two are severe windstorms.
Similarly I check for 'professor' - the synonyms are:
holder of a chair, chair, head of faculty, head of department
None of these seem to be correct - not all professors hold chair positions, not all of them are heads of department or faculty... The definition "highest-ranked academic" alone seems to be correct but the list of synonyms is not.
Is this more of a thesaurus list wrongly labeled as synonym list?