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A Grammatical Unit is any:  Word, Term, or (sometimes) Phrase — which functions as a single individual “Unit” within a Grammatical Device, such as:  a Clause, a Phrase, or an Interjection.
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All Grammatical Units are made-up-of the Grammatical Elements known-as:  “Letters” — and sometimes, the Grammatical Elements known-as: “Punctuation” (for example the Grammatical Element of the “Apostrophe” in the Grammatical Unit of the contracted Word, “You’re”.)  Grammatical Units are, then, combined to form Grammatical Devices like those mentioned above.
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Those Grammatical Devices are then combined (sometimes) with other Grammatical Units, and yet more Grammatical Elements of “Punctuation”, to form Grammatical Structures — i.e.: Sentences.  Those structures, then, grow-and-grow by the combination of yet more Grammatical Structures, to form even larger Grammatical Structures — i.e.:  Paragraphs.
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All of what is referred to in “Traditional  English Grammar” as:  “The Parts of Speech” — or more appropriately (but less commonly) termed as:  “Word Classes” — are, in The Common Tongue, referred-to as:  “Grammatical Units”.  These include  Adjectives, Adverbs, Conjunctions, (most) Interjections, Nouns, Numerals, Prepositions, Pronouns, & Verbs — as-well-as their related Phrasal (but not *Phrase) forms.
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See Also:

• • Grammatical Element
  • Grammatical Device — (Coming Soon)
  • Grammatical Structure — (Coming Soon)

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