Analysis of information sources in references of the Wikipedia article "Compound (linguistics)" in English language version.
English compounds cannot be defined as an uninterrupted sequence of characters
The compound can be a closed compound, where the two words are written together (e.g., blackboard), an open compound, where they are written separate (e.g., ice cream), or hyphenated, with a hyphen in between (e.g., short-term).
a compound whose word components are separated by a space in printing or writing
