frequency vs absolute frequency

frequency and absolute frequency both are nouns.

Word	Noun	Adjective	Verb	Adverb
frequency	Yes	No	No	No
absolute frequency	Yes	No	No	No

As nouns, frequency and absolute frequency are synonyms defined as:

frequency and absolute frequency: the number of observations in a given statistical category

frequency (noun)	absolute frequency (noun)
the number of observations in a given statistical category	the number of observations in a given statistical category
the ratio of the number of observations in a statistical category to the total number of observations
the number of occurrences within a given time period