Here's what rhymes with reductionist.

Consider these alternatives

materialist / imperialist simplistic / characteristic mechanistic / characteristic legalistic / characteristic rationalistic / characteristic myopic / logic positivistic / characteristic parsimonious / erroneous phenomenological / logical dualistic / characteristic materialistic / characteristic conceptualization / relation construal / fuel dualist / individualist doctrinaire / their idealization / relation rationalists / nationalists psycholinguistic / characteristic reductionism / given conceptualisation / relation idealised / realized propounding / founding idealizing / realizing