Grammar

Judicial relates to courts, judges, or legal proceedings, serving as a descriptive term. Words that describe or qualify are adjectives. It modifies nouns like 'judicial system' or 'judicial review'. Nouns would name the court itself.

Juice is a liquid substance - a physical thing. Substances are named by nouns. Nouns identify things you can see, taste, or touch. Verbs would show action (to juice something), but the word itself names the liquid.

To jumble means to mix things together in a confused way - an action. Actions are expressed by verbs. You can say 'jumble the pieces' or 'the papers were jumbled'. Nouns would name the result (a jumble).

Jumbo is most commonly used as an adjective meaning very large (jumbo jets, jumbo shrimp). However, it can also function as a noun in informal contexts. The answer key marks it as noun, which is acceptable though less common.

Jubilant describes a feeling or state of great joy - it shows the quality or manner of someone. Descriptive words are adjectives. It modifies people (jubilant crowd) or expressions (jubilant smile). Verbs would show action.

Judge can be both a noun (a person who decides cases) and a verb (to form an opinion). The question expects the noun form - a judge is a person/role. Nouns name people and their positions. Verbs would show the action of judging.

Jump is primarily an action word (verb) describing the act of propelling oneself into the air. While it can function as a noun in contexts like 'a high jump,' its most fundamental and common use is as a verb indicating physical motion.

Junction is a noun referring to a point where two or more things meet or connect, such as roads, railway lines, or electrical circuits. It names a place or thing rather than describing an action or quality.

Junior functions as an adjective when describing someone younger or less experienced (like 'junior employee'). While it can appear before a name as a title, it fundamentally modifies the noun by indicating relative age, rank, or experience level.

Juncture is a noun referring to a particular point or critical moment in time, or a place where things join. It represents a specific point or circumstance, making it clearly a naming word rather than an action or description.

Just can function as an adverb (modifying verbs like 'just arrived') or an adjective (meaning fair or righteous). When used to mean 'very recently' or 'barely,' it is most commonly an adverb. Option C is reasonable, though context matters.

Junk is a noun referring to discarded material, old articles, or useless things. It names a category of objects rather than describing an action, quality, or relationship, making noun the correct classification.

Jut is primarily a verb meaning to extend or protrude beyond a surface or boundary (like 'rocks that jut out'). While it can appear as part of phrasal verbs or in other constructions, its core use describes the action of sticking out or projecting.

Justice is a noun referring to the quality of being fair and reasonable, or the administration of law. It names an abstract concept or principle rather than describing an action, making noun the correct classification.

Juvenile is an adjective meaning relating to young people or showing characteristics of youth (like 'juvenile behavior'). It modifies nouns by indicating age-related qualities rather than naming something directly.