Basically, the term ' more ' refers to a larger amount or degree, while ' most ' refers to the largest amount or degree. In other words, 'more' is considered a comparative form, while 'most' is considered a superlative form. is used before some adjectives or adverbs to compare two things.

Comparative: Use “more” before the adjective. Example: Modern (adjective) → More modern than (comparative). New York is more modern than Pa ris. Superlative: Use “the most” before the adjective. Example: Modern (adjective) → The most modern (superlative). This is the most modern car produced so far.

With most one-syllable adjectives, we add –er or –est, and with most adjectives with two syllables or more, we add more or (the) most. In comparatives, we also use than before the second thing which is compared, if it is mentioned.

For adjectives with two syllables we generally use 'more' or 'most'. But some two syllable adjectives can take 'er' or 'est'. It's also fine to use 'more' (for the comparative) or 'most' (for the superlative).