What do you call this part-of-speech called?
What is this ~est+(word) sentence part called?
... is the highest-efficiency washing machine.
...is the highest-earning celebrity in the country.
... is the highest-paid baseball player in the world.
... is the highest-grossing movie of the year.
I have seen them called one-thought adjectives, compound adjectives, and compound modifiers. The construction is an adjective combined with a noun or participle used as a noun. These two words then act as a single adjective to modify a noun.
Here is an explanation of the use of a hyphen I copied from the National Geographic style manual. Other style manuals may have different guidlines.
A compound with an ordinal, a comparative, or a superlative is not hyphenated except to prevent ambiguity:
fifth largest city
farthest reaching trade
the best known person
the first ever race
second-growth timber third-ranked convention city best-selling novel faster than normal ship
|link comment||edited Mar 18 at 11:28 Lewis Neidhardt Grammarly Fellow|
Hero of the day
Person asked the most questions.