pulse counter vs scaler

pulse counter and scaler both are nouns.

Word	Noun	Adjective	Verb	Adverb
pulse counter	Yes	No	No	No
scaler	Yes	No	No	No

As nouns, scaler is a hyponym of pulse counter; that is, scaler is a word with a more specific, narrower meaning than pulse counter:

pulse counter: an electronic counter that counts the number of electric pulses
scaler: an electronic pulse counter used to count pulses that occur too rapidly to be recorded individually

pulse counter (noun)	scaler (noun)
an electronic counter that counts the number of electric pulses	an electronic pulse counter used to count pulses that occur too rapidly to be recorded individually