Specific feedback:

> appositive
> 
> a noun that further explains (identifies or renames) another noun or pronoun nearby

Does this mean that 'motion' in 'motion picture' is an appositive?

> clause
> 
> a group of related words that contains a verb and its subject

Except when it doesn't contain a verb (e.g., With Scott absent, ...) or a subject (e.g., get lost).

> clause, adverb
> 
> a dependent clause that functions as an adverb

Adverb isn't a function, it's a category of lexemes (a "part of speech"). Adverbs have various functions (e.g., modifier in VP, AdjP, AdvP, clausal adjunct, complement) 

> clause, dependent (subordinate)
> 
> a clause that does not express a complete thought and cannot stand alone

What's a complete thought?

> clause, noun
> 
> a dependent clause that functions as a noun

Again, 'noun' isn't a function. 

> clause, relative
> 
> a dependent clause that functions as an adjective

adjective isn't a function.

> object, direct
> 
> a noun or pronoun that directly receives the action of the verb (ask: “[verb] + whom or what?”)

what about when there's no "action"? What does it mean to directly receive action?

> object, indirect
> 
> a noun or pronoun that indirectly receives the action of the verb (ask: “[verb] + to whom or what?”)

what about when there's no "action"? What does it mean to directly receive action? 

etc.

Rather than going on here, I'd suggest you take something like the glossary from Huddleston & Pullum's "A Students' Introduction to English Grammar" and try selecting from and adjusting the definitions there to suit your audience(s).

Best,
Brett

-----------------------
Brett Reynolds
English Language Centre
Humber College Institute of Technology and Advanced Learning
Toronto, Ontario, Canada
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