replace list of words

[Rozgar]

Hi
I would appreciate to help me this:
how to replace list of word (file1.txt) using another list (file2.txt)?
file1.txt looks like this:
word1
word2
word3

file2.txt looks like this:
word1 please replace it with me 1
word2 pleasereplaceitwithme2
word3 please_replace_it_with_me 3

thanks

[technocrat]

Without a reprex. See the FAQ, I am unsure of your intent, so

words1 <- data.frame(before = LETTERS)
words1
#>    before
#> 1       A
#> 2       B
#> 3       C
#> 4       D
#> 5       E
#> 6       F
#> 7       G
#> 8       H
#> 9       I
#> 10      J
#> 11      K
#> 12      L
#> 13      M
#> 14      N
#> 15      O
#> 16      P
#> 17      Q
#> 18      R
#> 19      S
#> 20      T
#> 21      U
#> 22      V
#> 23      W
#> 24      X
#> 25      Y
#> 26      Z
words2 <- data.frame(the_froms = LETTERS, the_tos = letters)
words1[1] <- words2[2]
words1
#>    before
#> 1       a
#> 2       b
#> 3       c
#> 4       d
#> 5       e
#> 6       f
#> 7       g
#> 8       h
#> 9       i
#> 10      j
#> 11      k
#> 12      l
#> 13      m
#> 14      n
#> 15      o
#> 16      p
#> 17      q
#> 18      r
#> 19      s
#> 20      t
#> 21      u
#> 22      v
#> 23      w
#> 24      x
#> 25      y
#> 26      z

# the exemplary data are pretty silly, since
# it could be done more directly
words1 <- data.frame(before = LETTERS)
tolower(words1[[1]])
#>  [1] "a" "b" "c" "d" "e" "f" "g" "h" "i" "j" "k" "l" "m" "n" "o" "p" "q" "r" "s"
#> [20] "t" "u" "v" "w" "x" "y" "z"

Created on 2023-01-19 with reprex v2.0.2

[Rozgar]

Thanks for your help