freightage vs freight rate

freightage and freight rate both are nouns.

Word	Noun	Adjective	Verb	Adverb
freightage	Yes	No	No	No
freight rate	Yes	No	No	No

As nouns, freightage and freight rate are synonyms defined as:

freightage and freight rate: the charge for transporting something by common carrier

Other synonyms of freightage include freight.

freightage (noun)	freight rate (noun)
transporting goods commercially at rates cheaper than express rates	the charge for transporting something by common carrier
the charge for transporting something by common carrier