Modifiers matching morpheme:

• grammatical,
• distinct,
• base,
• functional,

Simple categories matching grammatical:

• form,
• notion,
• category,
• component,
• theory,
• item,
• morpheme,
• constituent,
• pattern,
• person,
• unit,
• topic,
• feature,
• means,
• relationship,
• condition,
• clue,
• system,
• entity,
• relation,
• representation,
• mark,
• part,
• rule,
• language,
• change,
• property,
• structure,
• phenomenon,
• construction,
• formative,
• group,
• terminology,
• error,
• concept,
• knowledge,
• marker,
• signifier,
• style,
• mood,
• lexeme,
• characteristic,
• word,
• information,
• point,
• domain,
• class,
• attribute,
• area,
• cue,