How to use PorterStemmer function with a list of words

Question

def stem(word):
    global c_bot
    stemArray=[]
    stemArrayRan=[]

    conn = sqlite3.connect('userData.db')
    c=conn.execute('SELECT sensation from symptoms')
    sympsToStem=c.fetchall()

    sympToStem=''

    for sympToStem in sympsToStem:
        stemArray.append(sympToStem)
    #print("hello",list(sympToStem))
    print("*********")
    #print("stemmed finale",stemmer.stem(word.lower()))
    for h in range(len(stemArray)):
        counter=0
    print(list(stemArray[h]))
    word=list(stemArray[h])
    print("newfound",word)


    print("stemm it",stemmer.stem(word.lower()))



word=''
sentence=''
#sentence=c_bot.get()

#main()
    
tryy=stem(word)

I'm not sure why the function doensn't let me pass the variable 'word' as a list, but does anyone know how I can get it to stem individual words from a user input into a sqlite3 database?

This is the error:

line 76, in stem print("stemm it",stemmer.stem(word.lower())) AttributeError: 'list' object has no attribute 'lower'

#######

def submitChatbot():
    global c_bot
    # Create a database or connect to one
    conn = sqlite3.connect('userData.db')
    # Create cursor
    c = conn.cursor()

    # Insert Into Table
    c.execute("INSERT INTO symptoms VALUES (null,:c_bot)",
            {
                                'c_bot': c_bot.get().lower() 
                                
            })
    #Commit Changes
    conn.commit()
    # Close Connection 
    conn.close()

    # Clear The Text Boxes
    c_bot.delete(0, END)


def stem(word):
    global c_bot
    stemArray=[]
    stemArrayRan=[]

    conn = sqlite3.connect('userData.db')
    c=conn.execute('SELECT sensation from symptoms')
    sympsToStem=c.fetchall()

    sympToStem=''

    for sympToStem in sympsToStem:
        stemArray.append(sympToStem)
    #print("hello",list(sympToStem))
    print("*********")
    #print("stemmed finale",stemmer.stem(word.lower()))
    for h in range(len(stemArray)):
        counter=0
    print(stemArray[h])
    word=stemArray[h]
    print("newfound",word)


    print("stemm it",stemmer.stem(word))