infrared frequency vs frequence

infrared frequency and frequence both are nouns.

Word	Noun	Adjective	Verb	Adverb
infrared frequency	Yes	No	No	No
frequence	Yes	No	No	No

As nouns, frequence is a hypernym of infrared frequency; that is, frequence is a word with a broader meaning than infrared frequency:

infrared frequency: the infrared region of the electromagnetic spectrum; electromagnetic wave frequencies below the visible range
frequence: the number of occurrences within a given time period

Other hypernyms of infrared frequency include frequency, oftenness.

infrared frequency (noun)	frequence (noun)
the infrared region of the electromagnetic spectrum; electromagnetic wave frequencies below the visible range	the number of occurrences within a given time period