In German, two-part composite nouns (Schul·lehrer,
Schlüsel·loch, Elektronen·mikroskop, Sonnen·wende, etc.) are
abundant, but composite nouns consisting of three or more parts
are not at all uncommon: Grund·schul·lehrer,
Schlüsel·loch·chirurgie, Raster·elektronen·mikroskop,
Winter·sonnen·wende·punkt. In English, the joining of two nouns
into one (e.g. school·teacher, key·hole) also happens, but it is
not as common as in German (e.g. electron microscope, not
electron·microscope), and, as far as I can tell, it is limited
exclusively to two-part composites (one never sees composites
like elementary·school·teacher). But, if one considers only the
spoken language, then there's a close syntactical similarity
between, on the one hand, German composite nouns like
Raster·elektronen·mikroskop and Grund·schul·lehrer, and on the
other, English "nominal" collocations like scanning electron
microscope and elementary school teacher. Now, assuming this
correspondence between German composite nouns and English
nominal colloca