There are several synonym options for the word "formatively". Some of these include developmental, educative, informative, instructive and constructive. When describing how something is done in a formative way, one could use any of these words interchangeably to convey the same meaning. For example, a teacher might use formative assessments in order to inform their instruction and help develop their students' skills. In this case, one might also say that the assessments are constructive, instructive, developmental or educative. All of these words are useful in conveying the idea of something being done in a way that promotes growth, development and learning.