Well, there are some variations. The adjective perfect has the comparative form more perfect, and the superlative most perfect.
The verb perfect has the third person singular present perfects; the present participle perfecting; and the past participle perfected.
And, of course, the present participle of the verb, perfecting is also a gerund. And the past participle perfected is also an adjective.
The noun perfect is the present perfect, the past perfect, and the future perfect tenses for verbs. Other noun forms are perfecter, perfectness, perfection, and perfectionist.
Lastly there's the adverb perfectly.
If a term doesn't have a variable , then its probably a constant.
A term.
Term
the different of two perfect squares can be formed by taking any two perfect squared terms
The Answer Is Term !!
... is still a term. a term doesn't have to have a variable in it.
Treatment variable is another term for the independent variable.
There is no scientific term for variable. However, the word itself is used in the scientific community to portray something that is not constant or "changed" in any specific, theoretic, or hypothetical situation.
Another term is Responding Variable
For example in the term 3x the number is the coefficient of the variable x
A term that has no variable part is usually called a constant.
There is no term other than independent variable.