Hops and Opium

Hops noun - Twining perennials having cordate leaves and flowers arranged in conelike spikes; the dried flowers of this plant are used in brewing to add the characteristic bitter taste to beer.

Opium and hops are semantically related. In some cases you can use "Opium" instead a noun "Hops".

Opium noun - An addictive narcotic extracted from seed capsules of the opium poppy.

Hops and opium are semantically related. Sometimes you can replace term "Hops" with "Opium", this nouns are similar.