downtick vs transaction

downtick and transaction both are nouns.

Word	Noun	Adjective	Verb	Adverb
downtick	Yes	No	No	No
transaction	Yes	No	No	No

As nouns, transaction is a hypernym of downtick; that is, transaction is a word with a broader meaning than downtick:

downtick: a transaction in the stock market at a price below the price of the preceding transaction
transaction: the act of transacting within or between groups (as carrying on commercial activities)

Other hypernyms of downtick include dealing, dealings.

downtick (noun)	transaction (noun)
a transaction in the stock market at a price below the price of the preceding transaction	the act of transacting within or between groups (as carrying on commercial activities)