You use more to indicate that there is a greater amount of something than before or than average, or than something else. You can use 'a little', 'a lot ', 'a bit ', ' far ', and 'much' in front of more.

You use just to indicate that something is no more important, interesting, or difficult, for example, than you say it is, especially when you want to correct a wrong idea that someone may get or has already got.

Than is a grammatical particle analyzed as both a conjunction and a preposition in the English language. It introduces a comparison and is associated with comparatives and with words such as more, less, and fewer.

THAN definition: 1. used to join two parts of a comparison: 2. used with "more" or "less" to compare numbers or…. Learn more.

You use than after a comparative adjective or adverb in order to link two parts of a comparison. The radio only weighs a few ounces and is smaller than a mobile phone. She walks far more slowly than her mother.

Definition of than preposition in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

than /ðæn, ðɛn; unstressed ðən, ən/ conj. (used after comparative adjectives and adverbs and certain other words, such as other, more, etc., to introduce the second part of a comparison): an increase of more than fifty dollars a week; She's taller than I am. The rabbit runs faster than the turtle.