"Have occasion for" is a phrase that means to require or need something. There are several synonyms for this phrase, including "require," "need," "demand," "necessitate," "call for," "requisite," "entail," and "imply." These synonyms all refer to the idea that something is necessary or essential, and that there is some kind of requirement or obligation to fulfill a certain need or condition. Other related words might include "satisfy," "meet," "fulfill," or "accommodate," which indicate that the need has been met or fulfilled in a satisfactory way. Ultimately, the choice of synonym may depend on the context or tone of the sentence or passage in which it is used.