Parts of Speech Identification

The word 'Accumulation' is a noun, representing the act or process of gathering something together.

Acetic acid is a chemical compound, which functions as a noun in a sentence. It names a specific substance.

Active describes a state or quality, such as an active participant or an active volcano. Words that modify nouns in this way are adjectives.

Acoustic refers to sound or the sense of hearing, often used to describe instruments or properties. It functions as an adjective.

Agree is an action word used to express consent or concurrence. It is a verb.

An afterthought is a thing that is thought of or added later. It functions as a compound noun.

Adaptation refers to the process or result of changing to suit new conditions. It is a noun.

Budge is an action meaning to make the slightest movement. It is a verb.

Agronomy is the science of soil management and crop production. It is a noun.

Buckthorn is a type of shrub or tree. It is a noun.

Excellent describes something of extremely high quality. It is an adjective.

Exceedingly is an adverb that modifies adjectives or other adverbs, meaning to a great extent. It ends in -ly, which is common for adverbs.

Exceeding is used as an adjective to mean extreme or surpassing, such as in the phrase exceeding joy.

Exhalation is the act of breathing out. It is a noun.

Expression is a word for a look on a face or a phrase. It is a noun.

Expectation is a belief that something will happen. It is a noun.

Expendable describes something that is not worth keeping or is easily replaced. It is an adjective.

Exhale is the action of breathing out. It is a verb.

Exhaustive describes something that considers all possibilities or elements. It is an adjective.

 Bulky has to be the quality of something. It is light or bulky. Quality words are adjectives. 

Exchange is primarily a verb meaning to give one thing and receive another. While 'exchange' can be a noun, in usage without context the verb form is more commonly tested.

Exclusion is the act of excluding or the state of being excluded. It is a noun.

Bubblegum is a type of chewing gum. It is a noun.

Aimless describes something lacking a goal or purpose. It is an adjective.

Building names a structure - a physical thing with a roof and walls. While building is also the present participle of the verb 'to build', as a standalone word it is most commonly a noun.