Good afternoon and Word of farewell

Good afternoon noun - A conventional expression of greeting or farewell.

Word of farewell and good afternoon are semantically related. In some cases you can use "Word of farewell" instead a noun phrase "Good afternoon".

Word of farewell noun - An acknowledgment or expression of goodwill at parting.

Good afternoon and word of farewell are semantically related. Sometimes you can replace phrase "Good afternoon" with "Word of farewell", this phrases are similar.