Filter rows that contain exact strings in a column

I need to filter rows from df that contain air as a stand-alone word in a column

library(dplyr)
df <- data.frame(x = c(13, 34, 5, 124, 56),
                 y = c('air transport', 'hairdressing', 'airport', 'repair', 'frontend'))

This gives me rows that partially contain air

df %>% filter(grepl('air',y))

    x             y
1  13 air transport
2  34  hairdressing
3   5       airport
4 124        repair

Here is my intended result

   x             y
1 13 air transport

>Solution :

Use \\b to match a zero-length word boundary:

df %>% 
  filter(grepl('\\bair\\b', y))