There are various parts of speech - each with its own function in a sentence.
Describe qualities and can be compared: small - smaller - smallest
Examples: fast, cheap, hot
Describe circumstances such as place, time, reason, or manner; they refer to verbs
Examples: today, there, very
Accompany a noun, indicating its gender and case
Examples: the, a
Sound expressions that convey feelings, reactions, or sounds; often stand alone and are not embedded in sentence structure
Examples: Oh!, Hey!, crack
Connect words, phrases, or sentences
Examples: and, but, because
Capitalized; usually preceded by an article: the, a
Examples: (the) table, (the) freedom, (the) car
Indicate quantity, order, or an indefinite number
Examples: two, third, some
Stand in for nouns or refer to them
Examples: I, you, my, she, it, he
Usually placed before a noun; indicate spatial, temporal, or logical relationships
Examples: in, on, behind, after
Describe actions or states; they can be conjugated (I think, he thinks)
Examples: run, be, think
The core of Parts-of-speech.Info is based on the Stanford University Part-Of-Speech-Tagger.
Please be aware that these machine learning techniques might never reach 100 % accuracy.