You can use reorder() function
df <- data.frame(stringsAsFactors=FALSE,
word = c("get", "just", "good", "like", "know", "day", "new"),
freq = c(1672, 1639, 1402, 1227, 1175, 1150, 110)
)
library(ggplot2)
ggplot(df, aes(x = reorder(word, freq), y = freq)) +
geom_col() +
labs(title="Twitter ",
x = NULL,
y = "Frequency") +
coord_flip()

Created on 2019-04-04 by the reprex package (v0.2.1)