The phrase "is able to" refers to the capability to do something. Synonyms for this phrase include "can", "has the ability to", "capable of", "competent to", "proficient in", "skilled in", "adept at", "talented at", "qualified to", "able-bodied to", "competent enough to", "powerful enough to", "strong enough to", and "sufficiently skilled to". These synonyms can be used interchangeably depending on the context. Using a variety of synonyms in your writing enhances clarity and keeps it interesting for readers. It is important to choose the right synonym depending on the intended meaning of the sentence.