‘More‘ is an adverb when it forms the comparative of adverbs and adjectives. In the English Grammar Profile, at A2, point 9 in ADJECTIVES/comparatives/ COMPLEMENT OF ‘BE’ overlaps point 26 in ADJECTIVES which is defined as:
a range of comparative adjective phrases using ‘more’ + longer adjectives (usually three or more syllables).
A search in the iWeb corpus for:
more _JJ
1 MORE LIKELY 479744 B2 modality + infinitive + passive
I‘m about seven times more likely to be stopped and searched.
2 MORE IMPORTANT 265541 B2 intensified attributive comparative with MUCH
Well,
these guardians are doing a much more important job
just without the soundtrack.
3 MORE DIFFICULT 212237
that teens may find it more difficult
Results 4-50 were profiled:
A2 vocabulary in EVP:
more + (advanced|attractive|comfortable|dangerous|interested|modern|popular|useful) in PELIC occurs over 300 hits. Here we take one of each:
But in the future, the world’s ethics should be more advanced.
Japanese, Female, level 4, writing class
Also, I think that soccer [is] more exciting than football because in a soccer game you can feel more excited because at any minute the score could change and the game will be more attractive.
Arabic, Male, level 4, writing class
They want to have a more comfortable life
and find a job living like Americans.
Spanish,Male, level 4, writing class
To summarize, it is dangerous to do nothing, but what is more dangerous is to dream nothing.
Korean, Male, level 3, writing class
Since computers were invented, many people have become more interested in using them.
Chinese, Female, level 4, writing class
Moreover, there is a new trend in the European educational system, which is trying to evolve and to adapt its consolidated method of teaching in a more modern method that is quite similar to the American system.
Italian, Male, level 5, writing class
I think the Olympics are becoming more popular because they are the international activities.
Chinese, level 2, reading class
It’s good for you to learn more useful English.
Chinese, Female, level 3, writing class
Note that ‘more’ + ADVERB is considered B2.