'Gromko' means loud and 'shumno' means noisy. The difference between the words is equal to eng translation

Gromko -it is max volume. Shumno- when heard many difference loud sounds.

"Gromko" means a high volume level. "shumno" is an adverb, which is derived from the word "Shum". "Shum" means sounds that merge into something obscure and discordant, or perceived as a hindrance.

'Gromko' = Głośno (angl. Loud) "zbyt głośno wieje wiatr zbyt głośno echo brzmi " (Carrion – Niepamięć) - дословно "Слишком громко(сильно) дует ветер. Слишком громко эхо звучит." 'Szumno', czyli "dużo szumu". (angl. Noisy) Spodziewam się, że to ci pomoże :)

"Громко" is loudly "Шумно" is an adverb from "noisy" (шумный - masculine; шумная - feminine; шумное - neuter) A noisy place --- шумное место (n) A noisy station --- шумная станция (f) A noisy bus --- шумный автобус (m) --------------------------------------------------------- Here is a noisy place --- Здесь шумно