Here’s a grammar bite on comparative structures using ‘adjective+ er/more/less + than’ that we can use when we want to say that two items are different in a quality.
Remember that the general rule for one-syllable and some two-syllable adjectives, (small, clever, happy, etc.) is the affix -er, while other adjectives (honest, beautiful, interesting, etc.) have the word ‘more’ in front of them.