T vs t

T and t both are nouns.

Word	Noun	Adjective	Verb	Adverb
T	Yes	No	No	No
t	Yes	No	No	No

As nouns, T and t are synonyms defined as:

T (noun)	t (noun)
thyroid hormone similar to thyroxine but with one less iodine atom per molecule and produced in smaller quantity; exerts the same biological effects as thyroxine but is more potent and briefer	the 20th letter of the Roman alphabet
hormone produced by the thyroid glands to regulate metabolism by controlling the rate of oxidation in cells	a unit of weight equivalent to 1000 kilograms
the 20th letter of the Roman alphabet
one of the four nucleotides used in building DNA, also known as 5'-thymidylate, thymidylate, or TMP; all four nucleotides have a common phosphate group and a sugar (ribose)
a base found in DNA (but not in RNA) and derived from pyrimidine; pairs with adenine