The the level of linguistic structure at the variation "some people would say i snuck out of the house, while other people would say i sneaked out of the house." is morphological.
The study of words is known as morphology. Morphemes are the smallest meaning units of a word. These units can be stand-alone base words, prefixes, or suffixes.
The word 'sneak' is an example of a basic word. We might modify the meaning of the word 'sneak' by adding the suffix -y. It is now defined as an adjective of sneak, behaving in a secret and sometimes dishonest or unpleasant way
To modify the connotation, we might simply append the suffix -ed to the word 'sneak.' We are now employing the past tense. Other grammatical aspects included in morphology include adding -s or -es to the end of a word to make it plural.
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