What Is The Structure Of A Standard Dictionary !exclusive!

"Resource" could be "tool," "material," "aid."

For "headword", maybe replace with "main term" or "primary term". But I need to check if those are synonyms. The headword is the word being defined, so synonyms could be "primary term", "main word", or "central word". What Is The Structure Of A Standard Dictionary

"Professional" → "expert," "specialist," "practitioner." "Resource" could be "tool," "material," "aid