Head movement, the popular means for word-formation, explains the bi-clausal nature of verb-incorporation, the subject-object asymmetry of noun-incorporation, and various other facts of morphology. It is also believed to abide by Occam’s razor for needing only syntax to form clauses and words alike. Hardly any attention has been paid to those words with an internal modificative relation which would map to an adjunct structure, predict an island effect and thus forbid a derivation by head movement. Semitic causativization poses another challenge: a verbal root pairs with the bi-clausal structure but an adjectival root only displays mono-clausal behaviors. Further compounding the situation are the non-canonical arguments in Chinese, with monosyllabic verbs permitting the subject and object with oblique readings. The solution to all these facts is to exploit the logical and inevitable property of Merging two heads to yield a new head, the Structure Mapping Hypothesis already tacitly assumed in the current theory, and a more restricted use of bare roots. Again, both the problematic data and certain logical implications of the current theory have been overlooked due to MR.