Compound words beginning with i:
One compound word that begins with "hear" is "heartbeat."
overweight
Melodramatically is a 16 letter word. It begins with the letter me.
The word x-ray is a common compound noun. The word Xbox is a proper compound noun.
lakefront
somebodysomedaysomehowsomeonesomeplacesomethingsometimesometimessomewhatsomewhere
kingpin
viewpoint
printableprintout
One such word is bottleneck.
A word for patient that begins with the letter a: accommodating.
Hexamethylenetetramine is a word that contains 22 letters. It is a chemical compound that is used in the production of plastics, pharmaceuticals and rubber products.