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The results of a spectral survey of the region of massive star formation DR21OH in the 4-mm wavelength range are presented. Sixty-nine molecules and their isotopologues have been detected, ranging from simple diatomic or triatomic species such as SO, SiO and CCH, to complex organic molecules such as CH
3
OCHO or CH
3
OCH
3
. The obtained results qualitatively repeat the results of the survey of the same source at 3 mm. The inventories of molecules found at 3 and 4 mm overlap to a great extent. However, at 4 mm we found a number of species that have no allowed transitions in the 3-mm wavelength range, e.g., DCN, DNC, or SO
+
. The bulk of the molecules detected at 4 mm are those that are common for dense cores, e.g., HC
3
N or CH
3
CCH, but some of the detected species are typical for hot cores. The latter include complex organic molecules CH
3
OCHO, CH
3
CH
2
OH, CH
3
OCH
3
, etc. However, the detected emission of these molecules probably arises in a gas heated to 30 K only. Nine molecules, including complex species CH
3
C
3
N, CH
3
CH
2
CN, CH
3
COCH
3
, were found by spectral line stacking. This demonstrates the prospects of the method in the study of molecular clouds.