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Adverbs are concepts of the characteristics of motion (or action); they are formed by specifying a characteristic and omitting the measurements of the motion and of the entities involved—e.g., "rapidly," which may be applied to "walking" or "swimming" or "speaking," etc., with the measurement of what is "rapid" left open and depending, in any given case, on the type of motion involved.

Prepositions are concepts of relationships, predominantly of spatial or temporal relationships, among existents; they are formed by specifying the relationship and omitting the measurements of the existents and of the space or time involved—e.g., "on," "in," "above," "after," etc.

Adjectives are concepts of attributes or of characteristics. Pronouns belong to the category of concepts of entities. Conjunctions are concepts of relationships among thoughts, and belong to the category of concepts of consciousness.

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