The difference between compounds and phrases has been studied extensively in English (e.g., Farnetani, Torsello, & Cosi, 1988; Plag, 2006; Štekauer, Zimmermann, & Gregová, 2007). However, little is known about the analogous difference in Modern Greek (Tzakosta, 2009). Greek compounds (Ralli, 2003) form a single phonological word, and thus, they only contain one primary stress. That means that the individual words lose their primary stress. The present study is the first acoustic investigation of the stress properties of Greek compounds and phrases. Native speakers of Greek produce ten novel adjective + noun compounds and their corresponding phrases (e.g., phrase: [kócino δódi] “a red tooth” vs. compound: [kocinoδódis] “someone with red teeth”) in the sentence corresponding to “The XXX is at the top/bottom of the screen.” Preliminary results confirm the earlier descriptive claims that compounds only have a single stress, while phrases have one on each word. Specifically, the first word (i.e., adjective) in compounds is reduced in F0 (101 Hz), duration (55 ms), and intensity (64 dB) compared to phrases (F0 = 117Hz, duration = 85 ms, and intensity = 67 dB). Also, both words are very similar for all of the measures in phrases. The second word (i.e., noun) is longer than the first word, possibly indicating phrase-final lengthening.