I think it is climate change
I think rainbow is a compound word because rain and bow is a word.
earthquake / earthworm / earthworks / earthman
An antonym for the word "climate" could be "weather" or "condition."
The word climate has two syllables. The syllables are cli-mate.
Yes, "underground" is a compound word, formed by combining the words "under" and "ground."
The compound word that begins with hear is hearsay.
overweight
The word x-ray is a common compound noun. The word Xbox is a proper compound noun.
kingpin
printableprintout
lakefront
somebodysomedaysomehowsomeonesomeplacesomethingsometimesometimessomewhatsomewhere
viewpoint
Handshake.
Compound words beginning with i:iceboxicecapice creamicepickicebreakerintoinkwellinlayinflowinfluxinboundincomingironworkironcladinchwormindoorsinsideinsoleinfuseinstepitselfinmateinroadsinkblot
Xanthene is a chemistry word. It is a chemical compound.
One such word is bottleneck.