  Symmergent gravity is an emergent gravity framework in which gravity emerges
guided by gauge invariance, accompanied by new particles, and reconciled with
quantum fields. In this paper, we perform a detailed study of the quasinormal
modes and greybody factors of the black holes in symmergent gravity. Its
relevant parameters are the quadratic curvature term $c_{\rm O}$ and the vacuum
energy parameter $\alpha$. In our analyses, effects of the both parameters are
investigated. Our findings suggest that, in both positive and negative
direction, large $|c_{\rm O}|$ values of the parameter on the quasinormal modes
parallel the Schwarzschild black hole. Moreover, the quasinormal model spectrum
is found to be sensitive to the symmergent parameter $\alpha$. We contrast the
asymptotic iteration and WKB methods in regard to their predictions for the
quasinormal frequencies, and find that they differ (agree) slightly at small
(large) multipole moments. We analyze time-domain profiles of the
perturbations, and determine the greybody factor of the symmergent black hole
in the WKB regime. The symmergent parameter $\alpha$ and the quadratic
curvature term $c_{\rm O}$ are shown to impact the greybody factors
significantly. We provide also rigorous limits on greybody factors for scalar
perturbations, and reaffirm the impact of model parameters.
