Are Some Languages Easier to Learn Than Others?

During break I don't know how the subject came up, but my grandma and I were discussing if some languages were harder to learn than others. I said to her that I thought that English was an easy language to learn but that was because it is our first language and we grew to learn English. I told my grandma that I also thought that if English wasn't a persons first language, then it would be very hard to learn and get used to. My grandma agreed and said that we have so many different, sometimes useless words that have the same meaning which must make it difficult for kids to learn because they might be used to saying one word for the longest time and then someone tells them to use a different word with the same meaning, and it would just make them get confused because it could be a similar meaning but not the exact same definition. I thought that Spanish is a pretty easy language to learn because there are not a large amount of words that a person must know to make up a sentence or have a small conversation with. Probably one of the most challenging parts of learning a language is when using the tenses. For Spanish, that is the one of the things I  struggle with. So are some languages easier to learn than others? I think so, but just learning a new language does have some sort of challenge at times for any person.