Problem with tkinter and string

[Dule]

Code:

from tkinter import *
import random
from tkinter.messagebox import*
def checking():
outPut=10
overLap=Label(text=outPut)
overLap.place(x=200,y=100)
stringForChecking=str(inputForLetters.get())#ERROR
print(stringForChecking)
answer=str(word.get())#ERROR
if stringForChecking in answer:
overLap=Label(text=outPut)
overLap.place(x=100,y=100)
else:
outPut=outPut-1
overLap=Label(text=outPut)
overLap.place(x=100,y=100)
return()
turn=0
# izbor rijeci
words=['pas','mačka']
#odabir random rijeci
word=(random.choice(words))
#imenovanje varijeble za skrivanje rijeci
wordHidden=''
#for petlja za dodavanje u wordHidden
for char in word:
wordHidden=wordHidden+'_'
wordHidden=wordHidden+' '

#GUI
#stavljane prozora
t=Tk()
t.config(bg='white',width=500,height=200)
#label za pogadanje rijeci
wordToGuess=Label(t,text=wordHidden)
wordToGuess.place(x=60,y=15)
#entry za pogadanje slova
inputForLetters=Entry()
inputForLetters.place(x=20,y=60)
#label za broj preostalih pokusaja
inputGuesses=Label(t,text="Preostali pukusaji: ")
inputGuesses.place(x=80,y=100)
#label za broj preostalih rijeci za pogodit
GuessesLeft=Label(t,text="Broj preostalih rijeci: ")
GuessesLeft.place(x=80,y=150)
#gumb za pozivanje funkcije
if turn<10:
btnForSubmiting=Button(t, text='Pogodi', command=checking)
btnForSubmiting.place(x=10,y=100)
else:
showinfo('GAME OVER')
mainloop()

Error:

Exception in Tkinter callback
Traceback (most recent call last):
File "C:\Users\Sava\AppData\Local\Programs\Python\Python36-32\lib\tkinter\__init__.py", line 1699, in __call__
return self.func(*args)
File "C:\Users\Sava\Desktop\PyGame\igra2.py", line 10, in checking
answer=str(word.get())#ERROR
AttributeError: 'str' object has no attribute 'get'