f vs F

f and F both are nouns.

Word	Noun	Adjective	Verb	Adverb
f	Yes	No	No	No
F	Yes	No	No	No

As nouns, f and F are synonyms defined as:

f (noun)	F (noun)
the 6th letter of the Roman alphabet	the 6th letter of the Roman alphabet
	the capacitance of a capacitor that has an equal and opposite charge of 1 coulomb on each plate and a voltage difference of 1 volt between the plates
	a degree on the Fahrenheit scale of temperature
	a nonmetallic univalent element belonging to the halogens; usually a yellow irritating toxic flammable gas; a powerful oxidizing agent; recovered from fluorite or cryolite or fluorapatite