Ism and Secular humanism

Ism noun - A belief (or system of beliefs) accepted as authoritative by some group or school.

Secular humanism and ism are semantically related. In some cases you can replace phrase "Secular humanism" with "Ism", this terms are similar.

Secular humanism noun - The doctrine emphasizing a person's capacity for self-realization through reason; rejects religion and the supernatural.

Ism and secular humanism are semantically related. You can use "Ism" instead a noun phrase "Secular humanism".