If I'm not mistaken, REACT is a compound word.
baseballbasketballblackballbutterballcannonballcornballdirtballeyeballfireballfootballfastballfuzzballgumballhairballhandballhighballkickballmeatballmothballnetballoddballpaintballpinballracquetballscrewballsnowballsoftballspitballtarballtrackballvolleyball
airspaceanyplacebackspacecoalfaceeveryplacefireplacefootracemarketplaceoutfaceoutpacepalacesomeplaceworkplaceworkspace
wingspread
airwayalleywayanywaybreezewaydoorwaydrivewayfairwayflywayfreewaygetawayhideawayhighwayhallwayheadwayhideawaymidwaymotorwayparkwaypassagewaypathwayracewayrailwayroadwayseawaysomewayspeedwaystairwaysubwaytidewaytrackwaytramwayunderwaywalkwaywaterway
Clothespin and topspin are compoundwords ending in 'pin'.
Passerby is a compound word ending in by.
baseballbasketballblackballbutterballcannonballcornballdirtballeyeballfireballfootballfastballfuzzballgumballhairballhandballhighballkickballmeatballmothballnetballoddballpaintballpinballracquetballscrewballsnowballsoftballspitballtarballtrackballvolleyball
there is no compound word in English ending with zebra. I looked in the dictionary.
If there is no significant word in a compound word, you can add the plural ending directly to the last word in the compound.
If there is no single significant word in a compound word, add the plural ending to both parts of the compound word.
One example of a compound word ending with "heat" is "heartbeat."
One compound word ending with by is......... Driveby!
The word is inservice.
houseboat?
housekeeper
there is no compound word in English ending with zebra. I looked in the dictionary.
Compound words ending with belly: beer belly, pot belly