The sentence should be hyphenated thus:
'It is the highest-grossing movie of the year.'
The adjective is 'highest-grossing' - the superlative form of 'high-grossing'.
The predicate adjective is "popular". It follows the linking verb "was".
The word 'this' is a demonstrative pronoun and an adjective. The word 'this' is also an adverb (modifies another adverb).Examples:This is a very good movie. (demonstrative pronoun)You will like this movie. (adjective)I can't believe you finished this quickly. (adverb)
The test was long.A predicate adjective modifies or describes the subject.The movie was fun and interesting.Fun and interesting describe the movie making them the predicate adjective.
The adjective for excited is exciting. Example: That was an exciting movie!
The word 'other' is both an indefinite pronoun and an adjective. When the word other stands alone in the sentence, taking the place of a noun for something, it's an indefinite pronoun. When the word alone is placed just before a noun to describe the noun, its an adjective. Examples:Pronoun: This one is nice but I also like the other.Adjective: The other movie is an action adventure.
As of May 01st 2018, Black Panther is the highest grossing superhero movie in America [& the third highest grossing movie ever]Worldwide box office, The Avengers is the highest grossing superhero movie followed by Avengers Age of Ultron & Black Panther.
James Cameron's Avatar is the highest grossing movie worldwide w/ $2,787,965,087.
Avatar is the highest grossing Oscar winning movie of all time worldwide.Avatar is also the highest grossing Oscar winner domestically because the highest grossing movie, Star Wars: The Force Awakens did not win in the 5 Oscar categories in was nominated for.When adjusted for inflation, Gone with the Wind in the highest grossing Oscar winning movie.-If you mean the highest grossing movie that won the Best Picture Oscar, that would also be Gone with the Windunadjusted for inflation. It made 199 million dollars.
The highest grossing Australian movie is Crocodile Dundee, with box office grosses over $47 million in 1986.
Australia
Titanic
Most popular: Horror Highest Grossing: adults
By highest selling, I assume you mean highest grossing. Highest Grossing Movie in the U.S.A (not adjusted for inflation): Titanic (1997) -- $600,779,824 (not adjusted) or $908,688,900 (adjusted) Highest Grossing Movie in the U.S.A (adjusted for inflation): Gone with the Wind -- $198,676,459 (not adjusted) or $1,430,476,000 (adjusted)
The highest grossing Australian movie of all time is Crocodile Dundee, with $44.7 million.
Harry Potter
The Lion King :)
Avatar (2009). It grossed over $2.7 billion