What is the main difference between a phoneme mental unit and a phone sound physical realization?
A phoneme is an abstract, mental representation of a sound that carries contrastive meaning in a language

What do you call the smallest unit of meaning in a language that cannot be broken down further?
A morpheme.

What is the technical term for the literal, dictionary definition of a word, as opposed to its emotional association?
Denotation.
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What is an allophone, and what are the variants of the phoneme /d/ in Spanish?
An allophone is a phonetic variation of a single phoneme that does not change the meaning of a word. The phoneme /d/ in Spanish has two main allophones:d and

How is the word "brunch" formed from "breakfast" and "lunch"? What is this word-formation process called?Blending (or a portmanteau word).
Blending (or a portmanteau word).
In hierarchical meaning, "dog" is a specific instance of "animal". What is the specific term for "dog" in relation to "animal"?
A hyponym.
How are vowels classified according to the point of articulation and the mouth opening?
Vowels are classified based on two main criteria:Point of articulation (Tongue position - front to back):
Front: /i/, /e/
Central: /a/
Back: /o/, /u/
What is the base part of a word that carries its core meaning after removing all prefixes and suffixes, such as "friend" in "unfriendliness The root (or stem)
The root (or stem)
If the statement "Every cat is an animal" is true, then "Fido is a cat" automatically means "Fido is an animal". What semantic relationship is this
Entailment