unitsmorphemes
Unitsmorphemes are a linguistic concept referring to morphemes that can stand alone as independent words and also function as grammatical markers. These morphemes carry both lexical meaning and grammatical function, blurring the lines between content words and function words. For example, in English, the morpheme "run" can be a verb (lexical meaning: to move rapidly on foot) and also indicate present tense when used with a plural subject or first/second person pronoun (grammatical function: present tense). Similarly, "walked" contains the root "walk" with lexical meaning and the suffix "-ed" which signifies past tense, also a grammatical marker.
The concept of unitsmorphemes highlights the complex nature of morphemes, which are the smallest meaningful units