A vs biochemistry

A and biochemistry both are nouns.

Word	Noun	Adjective	Verb	Adverb
A	Yes	No	No	No
biochemistry	Yes	No	No	No

A (noun)	biochemistry (noun)
the blood group whose red cells carry the A antigen	the organic chemistry of compounds and processes occurring in organisms; the effort to understand biology within the context of chemistry
the 1st letter of the Roman alphabet
the basic unit of electric current adopted under the Systeme International d'Unites
a metric unit of length equal to one ten billionth of a meter (or 0.0001 micron); used to specify wavelengths of electromagnetic radiation
any of several fat-soluble vitamins essential for normal vision; prevents night blindness or inflammation or dryness of the eyes
one of the four nucleotides used in building DNA, also known as deoxyadenylate, or dAMP; all four nucleotides have a common phosphate group and a sugar (ribose)
(biochemistry) purine base found in DNA and RNA; pairs with thymine in DNA and with uracil in RNA